I doubt there will be a ppa, but you can surely download the official builds from ftp.mozilla.org/pub/calendar/lightning/nightly/latest-comm-miramar (or maybe latest-comm-aurora)
I doubt there will be a ppa, but you can surely download the official builds from ftp.mozilla. org/pub/ calendar/ lightning/ nightly/ latest- comm-miramar (or maybe latest-comm-aurora)